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LUO Longfu,ZHOU Jingxuan,TIAN Ye,YAN Yafei.Multilevel Railway Power Conditioner System Based on YNvd Transformer[J].JOURNAL OF POWER SUPPLY,2019,17(5):120-128
Multilevel Railway Power Conditioner System Based on YNvd Transformer
Received:April 26, 2018  Revised:June 18, 2018
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DOI:10.13234/j.issn.2095-2805.2019.5.120
Keywords:railway power conditioner(RPC)  modular multilevel converter(MMC)  balanced transformer  negative-sequence current  harmonic  hierarchical control
Fund Project:Natural Science Foundation of China(51477046)
           
AuthorInstitutionEmail
LUO Longfu School of Electrical and Information Engineering, Hunan University, Changsha , China
ZHOU Jingxuan School of Electrical and Information Engineering, Hunan University, Changsha , China 510629676@qq.com
TIAN Ye School of Electrical and Information Engineering, Hunan University, Changsha , China
YAN Yafei School of Electrical and Information Engineering, Hunan University, Changsha , China
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Abstract:
      To solve the power quality problems in a high-speed railway tractive power supply system such as negative-sequence current and harmonic current, a multilevel railway power conditioner(MRPC) system based on YNvd bala-nced transformer is proposed, which adopts a novel MRPC consisting of four multilevel cascaded H-bridge links and the corresponding output filter inductors. Different from the conventional method, this system integrates one side of the MRPC directly into the β-phase flexible taps on the secondary side of the YNvd balanced transformer instead of into the feeder via a step-down transformer, thus reducing the system cost. The topological structure, equivalent model, and compensation principle of this system are analyzed. Furthermore, a hierarchical control strategy, which is composed of command current tracking, circulating current restraining and link voltage balance, is proposed. Finally, simulation results verify the feasibility and effectiveness of the proposed theory.
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